Writing to flash and EEPROM on the tinyAVR 1-series
Update your tinyAVR code to access memories when using 1-series tinyAVRs. Link here (PDF)
On tinyAVR® 1-series devices, access to Flash memory and EEPROM has been changed from that on previous tinyAVR devices. This means that existing code for writing to Flash and EEPROM on older devices must be modified in order to function properly on tinyAVR 1-series devices. This application note describes what has changed and how to adapt code to these changes.
Writing to flash and EEPROM on the tinyAVR 1-series – [Link]